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computer PS and ohm law

Discussion in 'Electronic Basics' started by Wandy, Dec 18, 2003.

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  1. Wandy

    Wandy Guest

    Hi

    I am trying to use an atx pc power supply without wasting your time going to
    details

    There are two type of connectors:
    1- One is 10pins x2 raw female connector
    2- 3or4 with one raw of four pins (these you hook them to HD, floppy D, etc…

    I think all I need is the first one

    Green should be connected to ground, now the question
    Some suggest using small resistor, where do I hook it

    If I need 12V which do I use? Yellow and ??
    If I need 5V which do I use? Red and ??
    If I need 3.3V which do I use? Orange and ??

    can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
    resistor so i get 6Amp and so on.

    thanks in advance


    Jed
     
  2. Ross Mac

    Ross Mac Guest

    Hi

    I am trying to use an atx pc power supply without wasting your time going to
    details

    There are two type of connectors:
    1- One is 10pins x2 raw female connector
    2- 3or4 with one raw of four pins (these you hook them to HD, floppy D, etc.

    I think all I need is the first one

    Green should be connected to ground, now the question
    Some suggest using small resistor, where do I hook it

    If I need 12V which do I use? Yellow and ??
    If I need 5V which do I use? Red and ??
    If I need 3.3V which do I use? Orange and ??

    can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
    resistor so i get 6Amp and so on.

    thanks in advance


    Jed
    That should be fine but make sure to use the power equation P=IE so you pick
    the correct wattage! It seems to me that 6amps at 12 volts is going to need
    at least a 72 watt, or the next size up, resistor....Why don't you just fuse
    it if you are worried about overdrawing the supply.
    That resistor would be quite large......Probably a 2 ohm 100 watt!!
    For the wire colors...I would just do a Google search...
    good luck on your project....Ross
     
  3. Ross Mac

    Ross Mac Guest

    Hi

    I am trying to use an atx pc power supply without wasting your time going to
    details

    There are two type of connectors:
    1- One is 10pins x2 raw female connector
    2- 3or4 with one raw of four pins (these you hook them to HD, floppy D, etc.

    I think all I need is the first one

    Green should be connected to ground, now the question
    Some suggest using small resistor, where do I hook it

    If I need 12V which do I use? Yellow and ??
    If I need 5V which do I use? Red and ??
    If I need 3.3V which do I use? Orange and ??

    can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
    resistor so i get 6Amp and so on.

    thanks in advance


    Jed
    One other thing here...if you are attempting to use this resistor as a
    current limiting device the calculation would be much different. Since the
    drop accross the resistor would depend on the internal resistance of the
    load. If you are just putting the resistor accross the supply, than 72 watts
    is it. If the resistor has .1 volts accross it then you would only need a 10
    watt resistor....I wasn't very clear on what you were trying to do here!
     
  4. Ken Taylor

    Ken Taylor Guest

    Hi Jed.

    What are people suggesting you use a resistor for? You *may* need to put a
    minimum load onto the +5V output so that it will regulate properly (or maybe
    even turn on at all). However you do not need a resistor to draw a
    particular current - if your load will draw 6 Amps, it will draw 6 Amps (as
    long as the power supply can cope).

    One or more of the wires on the connector(s) will go to ground, which you
    will find will connect with the blacks on the FDD/HDD cables - use a
    multimeter to find out which one(s) this is. The outputs are between the
    various outputs and this earth.

    Cheers.

    Ken
     
  5. Who suggested it? For what?

    When I searched for "atx pinout color", I found many
    web pages that have exactly the info you are asking for.
    This question would have been answered quicker by
    learning to use web search engines than by posting it
    here,.

    This page http://www.laserlab.com/atx_ps_connector.php
    says that you directly ground pin 14 (the green wire) to start
    the power supply.

    No mention of any resistor (unless it is to provide the
    MINIMUM 5V load.)

    Note that color codes are not necessarily standard.
    Pin connections ARE standard and you should work
    back from those.
    Black is usually the common ground for ALL voltages.
    Huh? What are you trying to do?
     
  6. DarkMatter

    DarkMatter Guest

    For somebody that claims to have been on the net as long as you
    have, you don't know a damned thing about how to quote previous texts.

    Get a real news reader, ya retard.
    ]
    Outhouse Express ain't it. Fucking retards, all of you OE users..
     
  7. DarkMatter

    DarkMatter Guest

    Then... your LAME ass double posted it. Oh boy... you really ARE
    experienced on the net... Not!

    You aren't a "years experienced" net user, you are a fucking net
    twit, just like I said you were, the first time I did... Months ago.
     
  8. DarkMatter

    DarkMatter Guest


    Absolutely true.
     
  9. Usually on the +5V. This is because cheap ATX PSU will not work
    properly without a minimum load on the +5V. More expensive ones, I
    don't have any problem starting them and using them without a +5V
    load.

    However, most ATX PSU cross regulate on the +5V and +12V so if you are
    going to draw quite a bit of power on the +12V, you will need a load
    on the +5V to keep the +12V voltage up.
    All with the black ground wires.
    6 Amps x 12 = 72 Watts, that 10W resistor will burn out pretty quickly
    :p Or parallel connect 10x 20 Ohmz 10W.

    You might wanna look at some of these things I've been looking at for
    that kind of purposes.

    http://www.brakingresistor.com/metal.htm

    I'm not recommending them as good or bad, I don't know. But these
    things appear to be only ones suitable for high loads on the +12V.

    --
    L.Angel: I'm looking for web design work.
    If you need basic to med complexity webpages at affordable rates, email me :)
    Standard HTML, SHTML, MySQL + PHP or ASP, Javascript.
    If you really want, FrontPage & DreamWeaver too.
    But keep in mind you pay extra bandwidth for their bloated code
     
  10. Ross Mac

    Ross Mac Guest

    Our childish Usenet Prick is back!.....You must have something better to do
    than this!
     
  11. Ross Mac

    Ross Mac Guest

    I don't see a double post here....drunk again and seeing double....You
    really should lay off the sauce kid!
     
  12. Hi

    I am trying to use an atx pc power supply without wasting your time going to
    details

    There are two type of connectors:
    1- One is 10pins x2 raw female connector
    2- 3or4 with one raw of four pins (these you hook them to HD, floppy D, etc.

    I think all I need is the first one

    Green should be connected to ground, now the question
    Some suggest using small resistor, where do I hook it

    If I need 12V which do I use? Yellow and ??
    If I need 5V which do I use? Red and ??
    If I need 3.3V which do I use? Orange and ??

    can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
    resistor so i get 6Amp and so on.

    thanks in advance


    Jed

    All the power and volts stuff aside, you have to ground the "Power good" pin
    on the long connecting plug. Its pin #14, most likely green.
    go here, it's a good source !
    http://www.hardwarebook.net/connector/power/atxpower.html
     
  13. DarkMatter

    DarkMatter Guest

    Damn..... he actually quoted correctly this time!
     
  14. DarkMatter

    DarkMatter Guest

    Hey, dipshit... Yeah YOU. You replied to the guy twice, or you
    posted the reply twice. Usenet doesn't make mistakes. YOU did.

    Shall I provide posting ID numbers, ya retard?
     
  15. Ross Mac

    Ross Mac Guest

    Time for you to go back where you came from... alt.drugs.pot ....keep
    swallowing the bong water boy!
     
  16. Ross Mac

    Ross Mac Guest

    Uhhh....the ID numbers are different as are the posts...
    I just saw you quadruple post alt.engineering.electrical (under you own
    definition anyway!)...
    You really are a sick individual... You expect everybody to post exactly
    like you do with exactly the same newreader.... You sure live a pathetic
    life! I would still recommend a few good 12 step programs for you... One for
    anger management and the others for your drug and alcohol problem!
    You mentioned I had only been on the newsgroups for a few months....not
    true....I have been away for a few years but had a copy of Agent back in 95
    and used to be quite active. My first access to the internet was with the
    old unix command prompt. I guess you just do a google search and begin the
    vitreol....Your lack of accuracy is well known kid....and your claims are
    wild and unsubstantiated. I have seen posts of you claiming to be a
    descendant of 2 presidents, having put up many a ham radio tower, delivering
    medical marijuana, you have a conformal coating fetish, you are a circuit
    board expert who never was in the business for even a day and let's not
    forget that you are the biggest and baddest with the largest prick . Now
    that I believe since you are ALL DICK!. You even posted the Apollo mission
    to the moon was hoax!.
    I suspect there are a couple hundred engineers that might like to talk to
    you about that piece of brilliance!
    So if anyone here is a "net twit".....well look in the mirror "Don'tMatter"
    and stop swallowing the bong water doper boy!
     
  17. DarkMatter

    DarkMatter Guest

    Look, dipshit, you replied to the guy, but you posted the reply
    twice.

    Nothing you can do will change that fact.
    No. You didn't. By any definition. You didn't *see* me do a
    goddamned thing, boy.

    No, dipshit. I expect you to suck up the same scrutiny that your
    lame ass heaps out. Except that you don't know what the **** you are
    talking about, nd you still feel the 12 year old need to post up a
    retarded song occasionally. How mature.... not.
    What anger? What drugs and alcohol? You're a goddamned idiot.
    No. I said that you only knew about headers for a few months, you
    fucking retard.
    We fdon\t need your "I was the first AOL customer" retarded baby
    bullshit again, dipass.
    I am. I'd bet that you cannot make such a claim. My blood makes
    the claim for me.

    You couldn't be any more retarded.
    I have.
    Nope. I actually farm the stuff. I am a care provider, not a
    delivery boy, dipshit. Big difference.
    No, I use conformal coatings on JHV assemblies, because it seals out
    moisture in the PCB, and gives the assembly years more life, and
    reliability.

    Could you be any more retarded? I think not.
    When you integrate 13kV capacitors into the sub-surface layers of a
    PCB assembly using polymide insulative layers, and eliminate the cost
    of 6 or 8 capacitors in a 50M piece order, saving the company a half
    million dollars for each penny saved, you can brag about it. Until
    then, you are just another little punk that used to crank a few
    boards.

    To you.... sure...
    No, dipshit. I did not. I have always posted AGAINST those
    retards, just like I post AGAINST your lame, retarded ass.

    YOu are a fucking retard boy. I watched every launch. I have
    models of the Saturn 5 booster, and Apollo mission modules.

    You're a fucking idiot. I never posted against the moon missions,
    dipshit.

    Put up the post ID, fuckhead. I'll prove you wrong.

    I can also cite years worth of posts in other groups that show I put
    down the hoax retards, just like I put down your retarded ass.
    You are as bad as any of those cranks ever could be.

    You failed miserably the last time you "searched up" my posts, and
    you did again here, dipshit. Get a clue.
    You're an idiot. You're a dumbfuck. You are so stupid, you can't
    even tell what I have or have not posted. That is pretty bad,
    considering that it is public record. You need to upgrade your
    ability to waste time, digging up "my" posts on the net. You are
    doing a sad job of it so far.

    You be 'tard, boy.
     
  18. news.ops.worldnet.att.net>,
    says...
    Back? The childish 43YO is not back. The prick is still here!
    ....and hasn't learned a single thing.

    It's amazing that one can survive into the forties with such a
    chip on the shoulder and nasty attitude. ...not to mention
    paying the rent with no knowledge. Though there is only one
    button on the fry-o-lator.
     
  19. news.ops.worldnet.att.net>,
    says...
    Hey, that was me he quad-posted to. ...and I feel cheated! His
    record is seven!


    Well, duh!
    Good grief no! DimBulb doesn't like multiple postings! ;-)

    <snipped much DimBulb trueisms>

    DimBulb has a *long* history (a.k.a. fat bytestard) of being an
    anti-social moron.
     
  20. Ross Mac

    Ross Mac Guest

    Dimbulb just makes it up as he goes...I post twice and he bitches, then he
    goes to another thread and quad posts. If anyone does a google search, they
    will see his antisocial rants and his ridiculous stands....not to mention
    what those of us have seen in this newsgroup! And like I have always said,
    this guy is a substance abuser...he claims to grow medical marijuana..
    yeah...and also claims he never uses...Uhhhh...just read the above post...I
    think he makes a pretty good case for a 12 step program! Ole TardMatter is
    swallowing the bong water again.....
    You have to wonder what he is like to work with....can you see him in a
    meeting jumping up from his stroller and yelling....
    You dipshit...you retard...you are and idiot! ( I could go on, but we all
    know the rest of his rants)
    He also claims in the above post that he was responsible for buried
    capacitance in innerlayers of circuit boards...another grandiose claim....I
    know the person that developed that, I worked for the company that held the
    patent and he had nothing to do with it! And, the circuit board
    manufacturers are the ones who build it not "ConformalBoy". Perhaps he wants
    bragging rights for specing it out....Now, that would REALLY impress me.
    Then he tells me, I cranked out pcb's for a living...he has not a clue what
    I did in that business...but we can suffice to say, I must not have been
    cranking out boards because I live on my investments!...........
    Need I say more??????
     
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